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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief JPEG File format support.
*
* \arg File name extension: jpeg, jpg
* \ingroup formats
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/image.h"
#include "asterisk/endian.h"
static struct ast_frame *jpeg_read_image(int fd, int len)
{
struct ast_frame fr;
int res;
char buf[65536];
if (len > sizeof(buf) || len < 0) {
ast_log(LOG_WARNING, "JPEG image too large to read\n");
return NULL;
}
res = read(fd, buf, len);
if (res < len) {
ast_log(LOG_WARNING, "Only read %d of %d bytes: %s\n", res, len, strerror(errno));
}
memset(&fr, 0, sizeof(fr));
fr.frametype = AST_FRAME_IMAGE;
fr.subclass.codec = AST_FORMAT_JPEG;
fr.data.ptr = buf;
fr.src = "JPEG Read";
fr.datalen = len;
return ast_frisolate(&fr);
}
static int jpeg_identify(int fd)
{
char buf[10];
int res;
res = read(fd, buf, sizeof(buf));
if (res < sizeof(buf))
return 0;
if (memcmp(buf + 6, "JFIF", 4))
return 0;
return 1;
}
static int jpeg_write_image(int fd, struct ast_frame *fr)
{
int res=0;
if (fr->frametype != AST_FRAME_IMAGE) {
ast_log(LOG_WARNING, "Not an image\n");
return -1;
}
if (fr->subclass.codec != AST_FORMAT_JPEG) {
ast_log(LOG_WARNING, "Not a jpeg image\n");
return -1;
}
if (fr->datalen) {
res = write(fd, fr->data.ptr, fr->datalen);
if (res != fr->datalen) {
ast_log(LOG_WARNING, "Only wrote %d of %d bytes: %s\n", res, fr->datalen, strerror(errno));
return -1;
}
}
return res;
}
static struct ast_imager jpeg_format = {
.name = "jpg",
.desc = "JPEG (Joint Picture Experts Group)",
.exts = "jpg|jpeg",
.format = AST_FORMAT_JPEG,
.read_image = jpeg_read_image,
.identify = jpeg_identify,
.write_image = jpeg_write_image,
};
static int load_module(void)
{
if (ast_image_register(&jpeg_format))
return AST_MODULE_LOAD_FAILURE;
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_image_unregister(&jpeg_format);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "jpeg (joint picture experts group) image format",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);
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